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Finding the Fourth Proportional to 81,373, 122,060.22 and 28,791.40

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Solution

The fourth proportional to 81,373, 122,060.22 and 28,791.40 is: 43,187.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,373 : 122,060.22 = 28,791.40 : x
  2. Step 2: Convert to fraction form
    81,373/122,060.22 = 28,791.40/x
  3. Step 3: Cross multiply
    81,373x = 122,060.22 × 28,791.40
  4. Step 4: Simplify right side
    81,373x = 3,514,284,618.11
  5. Step 5: Solve for x
    x = 3,514,284,618.11/81,373
  6. Step 6: Final answer
    x = 43,187.35

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.